Investigated children's and adolescents' involvement in mutual antipathies. Found that children and boys of all ages were more frequently involved in same-sex antipathies; involvement in mixed-sex antipathies was comparable for both genders. Same-sex antipathies were associated with antisocial behavior and social withdrawal for both age and gender groups, and to emotionality and lack of friendship support among adolescents; mixed-sex antipathies were associated with social adjustment depending on gender. (JPB)